Materials Literature
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A method for the fabrication of n-type porous silicon (n-PS) is developed. The Hall effect is applied in the fabrication process. The majority carriers in n-type Si (electrons) are swept down by the Lorentz force. Enough holes continuously appear on the surface layer to participate in chemical reaction during the etch…
Polycrystalline sample of Pb2Bi3SmTi5O18, a member of tungsten–bronze (TB) family, was prepared using a high temperature solid state reaction technique. X-ray diffraction (XRD) analysis indicated the formation of a single phase orthorhombic structure. AC impedance plots were used as a tool to analyse the electrical be…
The structure of synthetic levyclaudite-(Sb), approximately (Pb(1 - y)Sb(y)S)(1.357)[Sn(1 - x)(Cu(2))(x)S(2)], has been determined by single-crystal X-ray diffraction on the basis of the (3 + 2)-dimensional superspace approach. This misfit-layer compound, of the cylindrite type, results from the combination of two hea…
The Raman gain coefficient and bandwidth of tellurite glasses have been tailored by systematically adding WO3 and P2O5 in a TeO2–BaO–SrO–Nb2O5 glass system. The Raman gain coefficients of the resultant glasses were obtained from spontaneous Raman scattering experiments using a 633nm laser. The glasses developed here s…
Results of the excitation of surface waves in a photonic crystal (PC) with negative refraction slab are presented. The role of the surface termination of the finite PC in exciting surface waves and enhancing the transmission is examined. It is demonstrated that only for a specific surface termination, the surface wave…
Recently, heterodyne-detected optical Kerr effect (HD-OKE) spectroscopy was used to study dynamics of supercooled molecular liquids. The studies revealed an apparently new physical phenomenon that had not been reported before from the related depolarized light scattering (DLS), namely, an intermediate power law (nearl…
The authors analyze the implications of the recently reported results of ab initio calculations of formation energies of the Fe–Cr alloy. The formation energies show a change in sign from negative to positive as Cr composition increases above ∼10%. By developing a classic potential to evaluate the thermodynamic proper…
Effects of short-range magnetic order on magnetic entropy change have been studied for the manganese oxide Eu0.55Sr0.45MnO3. Superparamagnetic clusters composed of seven to ten Mn ions, depending on applied field, have been derived in the paramagnetic state of the compound based on the analysis of dc susceptibility. T…
The authors have systematically studied the correlation between valence electron concentration and elastic properties of RRh3B (space group Pm3¯m, prototype CaTiO3), where R=Y, Zr, and Nb, using ab initio calculations. As the valence electron concentration is increased, the bulk modulus increases by 28%, while C44 dec…
For the case of hexagonal ZnO waveguides the Helmholtz equation is solved numerically taking into account the anisotropy of both index of refraction and gain, as well as the material dispersion. The intensity distribution of all waveguide modes, their energy dependence, and the confinement as a function of the nanorod…
The flammability characteristics of jet fuel aerosols are critical to the development of fire-safe fuels. In efforts to design and characterize fire-safe fuels, an automated rotary atomizer has been constructed to produce fuel aerosols and measure their mist flammability properties. A particle analyzer has been couple…
Abstract Nanocomposites of styrene and vinyl phenol copolymers, which contain varying (10, 20, and 40 mol %) vinyl phenol content, were prepared with 1 wt % unoxidized, 1 wt % oxidized, and 5 wt % oxidized carbon nanofibers. Dynamic mechanical analysis and differential scanning calorimetry indicate that the composites…
The diameter-dependent spin polarization of zigzag (n, 0) boron nitride nanotubes (5⩽n⩽10) with two carbon atoms substituting one boron atom and one nitrogen atom was investigated using first principles calculations. The spin polarization of the injected carriers is found in the tubes with larger diameters (n⩾7) and i…
Voronoi-Dirichlet (VD) polyhedra and the method of intersecting spheres were used to analyze the crystal structures of 2,917 compounds containing 3,903 crystallographically non-equivalent types of LnO(n) polyhedra (Ln = La-Lu). It was established that Ln coordination numbers (CN) vary from 3 to 12, and 20 types of coo…
A long-range ordered magnetic domain structure was found in magnetitelike (Fe3−δO4, δ≈0.03) thin films prepared by molecular beam epitaxy on MgO (100) substrates. The stripelike magnetic domain structure arising after suitable postprocessing differs significantly from earlier observations. The field-dependent domain s…
Abstract Summary: Three propylene‐ethylene random copolymers, of varying ethylene content, were fractionated using preparative TREF. The TREF fractions were subsequently analysed offline by CRYSTAF, DSC, 13 C NMR spectroscopy, HT‐GPC, and WAXD. The effect of the ethylene comonomer on the crystallisability of the propy…
In this letter, the authors demonstrate isotropic Fe–Pt exchange-spring nanocomposite permanent magnets with a soft magnetic phase fraction of greater than 0.5 with a coercivity of 6.5kOe, single-phase-like magnetic behavior, and an energy product of 25.1MGOe. Sub-10-nm Fe–Pt clusters are formed with compositions in t…
The cross-section of an InGaAs∕GaAs rolled-up nanotube with an average inner diameter of 18nm and with a large number of windings is prepared by focused ion beam etching and investigated by transmission electron microscopy. This technique provides useful information about the shape and size of the inner as well as out…
A highly disordered pregraphitic carbon nanofiber with the product of its quasi-Fermi wave vector and mean free path close to 1 was fabricated using electrospinning technique. Strong localization made the conductivity vary with temperature as lnσ∝T−1∕2 from 300to5K, suggesting variable range hopping as the conductivit…
A one-dimensional assembly of cadmium sulfide (CdS) nanoparticles was prepared by using functionalized polymers with pendant Fréchet-type dendritic wedges of different generation. The novel dendronized polymers acted as both nanoreactors for the formation of CdS nanoparticles and a template to arrange the nanoparticle…